Wait a moment to let the step #8 harden a bit, and then move the flame to the other side and repeat heating till the folds are melted in. Wait a moment for it to become hard and then get the other two quarters, waiting a moment between each section. As you get better, you can get more sections done at one time till you can get the entire ring of the seal in one heating.
But watch out, if you wait too long between steps the glass is likely to crack either because you haven't finished smoothing out the seal and/or when you next bring the hot flame to the unfinished seal.
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